GETSID(3POSIX)

📦 version 2017a, in debian bookworm, debian trixie, ubuntu jammy, ubuntu noble, ubuntu resolute, ubuntu stonking

💖 GETSID(3POSIX) — the POSIX Programmer's Manual, but make it a group chat 💖

okay bestie, so this little cutie lives in the POSIX Programmer's Manual (yes, that manual, the 3POSIX one, the icon herself). Heads up though: this page is part of the POSIX Programmer's Manual, and the Linux implementation of this interface may differ — so like, consult the corresponding Linux manual page for the details of Linux behavior — or honestly the interface may not even be implemented on Linux. 🙈 So vibe check your platform first, fr fr.

✨ NAME ✨

getsid — get the process group ID of a session leader 👑

🌸 SYNOPSIS 🌸

#include <unistd.h>

pid_t getsid(pid_t pid);

🦋 DESCRIPTION 🦋

So getsid() shall obtain the process group ID of the process that is the session leader of the process specified by pid. That's the whole job. She's not complicated, she's just precise. 💅

And if pid is (pid_t)0? Then it specifies the calling process — i.e. you, bestie. Not me. You. 🫶

💜 RETURN VALUE 💜

Upon successful completion, getsid() shall return the process group ID of the session leader of the specified process. Slay.

Otherwise, it shall return -1 and set errno to indicate the error. 😭 That's the not-slay path.

🔥 ERRORS 🔥

The getsid() function shall fail if:

  • EPERM — the process specified by pid is not in the same session as the calling process, and the implementation does not allow access to the process group ID of the session leader of that process from the calling process. Like, you're not in her session, you don't get her info. Permission denied, respectfully.
  • ESRCH — there is no process with a process ID equal to pid. Ghosted. Literally nobody's home. 💀
The following sections are informative.

🎀 EXAMPLES 🎀

None. (Yes, really. Nothing. Empty. A vibe of pure potential. ✨)

🌈 APPLICATION USAGE 🌈

None. (Again! She said what she said.)

⭐ RATIONALE ⭐

None. (The reasoning? Immaculate. Undocumented, but immaculate.)

🧚 FUTURE DIRECTIONS 🧚

None. (The future is bright and also blank.)

🍓 SEE ALSO 🍓

  • exec
  • fork()
  • getpid()
  • getpgid()
  • setpgid()
  • setsid()

And the Base Definitions volume of POSIX.1‐2017, <unistd.h> — go read the header, bestie, it's giving lore.

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group — 2017 💖 mwah, that's the whole page, thanks for coming to my TED talk, periodt. 🫶✨

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